Note that Strangest of All has an attention-grabbing 1960s cover style, while the present edition of Strange World was obviously designed in the Chariots of the Gods? school.
At a later age I learned that Frank Edwards was a radio commentator. Still later I learned that caveat lector applies to most everything you read. And ultimately I came to be thankful for things like these breathless tales of "what if?". They are really valuable to the world when they stimulate a little wonder in somebody whose philosophical horizons are narrower that they should be. (This statement applies to more and more of the people I meet, the older I get!)
And did you hear that if you go all the way around on a swingset, swinging over the top, that you'll turn inside out? I heard somebody say it so it must be true!